正则<body onload="f.a.select();">
<?php
echo 'a:'.htmlspecialchars($a);
echo '
a1:';
$a1 = eregi_replace('(^[_.][:alnum:]-]+([[:alnum:]][[:alnum:]-]*.)+[[:alpha:]]{2,3}$)',' <a href="mailto:\1">\1</a> ', $a) ;
echo htmlspecialchars($a1);
echo "
a1:$a1";
echo '
a2:';
$a2 = eregi_replace('([[:alnum:]]+://([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}([#\?/\\][^#\?/\\][:space:]][^[:space:]]*)?)',
'<a href="\1" target="_blank">\1</a>', $a);
echo htmlspecialchars($a2);
echo "
a2:$a2";
// eregi('^[_.][:alnum:]-]+([[:alnum:]][[:alnum:]-]*\.)+[[:alpha:]]{2,3}$',$a) or die("not a email");
?>
<form name="f">
<input name="a" value="<?php echo $a; ?>">
<input type="submit" >
</form>
</body>
正则表达式判断email和URL, 帮忙看看有没有要补充的.
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